Apparatus for making plate glass



April 13 1926. 1,580,130

F. GELSTHARP APPARATUS FOR MAKING PLATE GLASS Filed July 9, l925 3 Sheets-Sheet 1 |NVENTOR 6 W 7 April 13,1926. I 1,580,130

F. GELSTHARP APPARATUS FOR MAKING PLATE GLASS Filed July 9, 1925 3 Sheets-Sheet 2 April 13,1926. r

F. GELSTHARP APPARATUS FOR MAKING PLATE GLASS 5 Sheets-Sheet 5 Filed Jwily 9, 1925 7 To all whom it may concern:

: specification.

Patented iprris, 1926.

1 UNITED STATES PAIENT OFFICE.

FREDERICK GELSTHARIZ'O]? TARENTUM, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH I i PLATE GLASS COMPANY, A CORTOR-ATION OF PENNSYLVANIA.

'nrrnnnrusron MAKING PLATE GLASS.

Application filed July 9,1925. Serial No. 42,536.v

Be it known that I, FREDERICK a citizen of the United States, and a resident. of Tarentum, in the county of Allegheny and State of Pennsylvania, have madea new and useful invention in..In1 grovements in an Apparatus for Making late Glass, of which the following is a The invention relates I apparatus for producing a continuous sheet or ribbon from the body of molten glass. It has for its primary object the provision of improved, -means. for accomplishing the function as above set forthand for producing glass of superior quality'wh'ich is'perfectly flat and relatively smooth, so that it requires a minimum amount of grinding-preliminary to polishing in the production of finished plate glass. One embodiment of the invention is illustrated. in" the accompanying drawings wherein?- Figure 1' is;a vertical section through the apparatus .on' the line I 'I of Fig. 2. Fig.

[2 is avertical" section on the line' II II -ofFig. 1.-. And 'Fig. 3 is a'liorizontal section on theline oi Fig. 1.

@Referringto imam A prefera 1 known regenerator type havin a 1 is the end of 'a melting tank y a at its end the-forehearth-orextension 2 with a pair of zutfofl? 3 and *1 arranged .as indicated in Fig. 1 These gates are supported from above bylmeans'of the chains 5 andifi car-. riedby suitable overhead lifting means, not

' flsho'wn,the gate 3 being of refractory material, such as clay, and the gate 4: being; of

metal-provided'with means whereby it may be cooled by a circulation'of water. The forehearth 2 is open at the top, and in this space is mounted a pair of sizing rolls 7 and 8, such rolls being journaled at their ends in-the standards 9, 9 carried upon the supports 10, 10. The standards are connected to'a swing comprising the end mem 'bers' 11,11 and the transverse rod 12. Provision is made for moving the swing togeth er withthe standards an'overhead crane, nots iown, provided with the chains 13,,13 secured to the transverse 17od'12. This also provides a means for ad- GELSTHARP,

suitable reduction of the wellan roll carried there: by into and-out of pos' ion by the use ofbath, the standards 9, 9 being supported at different elevations upon the members 10, 10 by the use of suitable liners.

The ends of the upper roll 8 are carried in suitable journal boxes in the standards 9, 9 andprovision is made for adjusting this roll. with respect to the roll 7 in the form of Wedges 14 operated by screws 15 swiveled to the wedges, this being a common expedient for adjusting rolls, so thatno detailed description is necessary; The lower roll 7 preferably has its axle 16 located above the surface of the glass and extending over the side walls of the forehearth, as indicated are connected at their ends with the swivels 17 and 18 by means of which water may be circulated through the rolls. The rolls are driven by means of the tumbler shafts 19, 20, such shafts in turn being driven from the shaft 21 through the, intermediary of gearing in the casings 22 and 23.

The glass sheet 24, as it is formed between the sizingrolls. 7 and 8 is carried laterally upon a bedmade up of the rollers 25, 2.6, 27, etc. which are hollow and suitably cooled.

These rolls are provided at their ends with sprockets and are driven by means of the sprocketphain 28. The temperature of the glass is-maintained during its passage from the sizing rolls to the leer 29 by means 'ofthe gas burners 30, 31, 32 and 33,.which extend laterally across the bed. The cooling of the glass is also retarded by means of the refractory top member 34:,such member being rei'novable by means of a crane provided with a chain 35. The rollers 25, 26, 27,. etc. conbe moved out of position, thus giving ac leer. The leer 29 may be of any approved type,fln 1t is preferably of the roller type having the rolls 37, 38, 39, etc. arrange so .165

as to form a continuation of the rolls which constitute the glass receiving bed, such rolls 'stituting the bed are journaled in a suitable frame which is carried upon the truck36, so.

that when it becomes necessary, 'the bed may being-driven bya chain 40 or other suitable driving mechanism. In order, to close the p triangular spaces at the ends of the rolls, the

' able brackets 43. These members close the spaces at the ends of the rolls and limitthc width of the sheet formed.

:rolls and into the leer.

In operation. the rolls 7 and 8 are driven continuously, drawing up from the'body of molten glass the sheet 24 which passes over the receivingbed at'the right of the The contactrof the glass with the rolls 7 and 8, and with the table 11, causes it to set to such an extent that it will not sag to any substantial deee when it passes oyer the rolls constie tuting the bed, and from this point on, any unevenness in the glass is flattened out as the sheet progresses over "the rollers and through the leer. The glass sheet is an-' nealed in the leer, and cut ofl. at the far end thereof, after which it is ground and polished in the usual way on circular tables or ina stnaight away surfacing operation.

The rolls 7 and 8 size the sheet to substantially its'final thickness, the surface formed. being relatively-smooth as compared with 7 plate glass cast in the usual way on tables,

ut requiring rinding and polishing due to the marring e ect of the surfiace of the rolls upon the soft-glass. When the rolls 7 and 8 and the glass receivin bed are removed, the opening above the orehearth is closed by the cover 44 of refractory material, which is shifted by acrane, whose chain 45 engages the metal swing-46 secured to the cover: 1

What I claim is: n

1: In combination, a glass tank having a 'foreheal'th or extension having an open top, a pair of horizontally driven and cooled sizing rolls arranged oneabove the-other in said open top with the lower roll partially immersed in the molten glass in thebed ex- 4 tending laterally :fl'Om a point adjacent the forehearth, and a glass receivin glass which formed. v

I testimony whereof, I have hereunto 1 subscribed my name this 29th day of June,

hearth, standards in which the ends of the rolls are journaled, means for supporting the standards for vertical movement,- and a glass receiving bed extending laterally from a point fadjacent the pass between the rolls for carrying away the glass which formed.

. 3. In combination, aglass tank having a forehearth or extension having an open top, a pair of horizontal driyen and cooled sizing IOlls arranged one above the otherin said open top with the lower roll partially immersed in the molten glass in vthe forem;

hearth and a glass receiving bed extending laterally from a point adjacent the pass between the rolls for carrying away the glass which is formed, the lower roll being located with its axle above the level of the glass in the forehearth and with. its ends lying just inside the inner faces of the side walls of'the forehearthi 4. In combination, a fo'rehearth or extension having an opentop, a pair of horizontal driven and cooled sizing rolls arrangedone above the other in said open top with the lower roll partially im-v mersed in the molten glassin the forehearth,

standards in which the ends of the rolls are journaled, 'means for supporting the standards-for vertical movement, means for adjustingthe upper roll up' and-"down in the y, glass tank having a standards and a glass receiving bed extend- ,ing laterally from a' point adjacent the pass between the rolls for carrying away the FREDERICK GEL TEA 

